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BA33D18HFP Datenblatt(PDF) 11 Page - Rohm

Teilenummer BA33D18HFP
Bauteilbeschribung  Dual Output Fixed Output LDO Regulators
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Hersteller  ROHM [Rohm]
Direct Link  http://www.rohm.com
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BA33D18HFP Datenblatt(HTML) 11 Page - Rohm

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BA3258HFP
BA33Dxx series
Datasheet
TSZ02201-0R6R0A600090-1-2
26.2012 Rev.001
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
●I/O equivalence circuit
BA3258HFP
BA33DxxSeries
Fig.27 BA3258HFP I/O equivalence circuit
Fig.28 BA33Dxx Series I/O equivalence circuit
●Power Dissipation
If the IC is used under excessive power dissipation conditions, the chip temperature will rise, which will have an adverse
effect on the electrical characteristics of the IC, such as a reduction in current capability. Furthermore, if the temperature
exceeds Tjmax, element deterioration or damage may occur. Implement proper thermal designs to ensure that the power
dissipation is within the permissible range in order to prevent instantaneous IC damage resulting from heat and maintain the
reliability of the IC for long-term operation. Refer to the power derating characteristics curves in Fig.29.
・Power Consumption (Pc) Calculation Method
・Power consumption of 3.3V power transistor:
PC1 = (VCC − 3.3) × IO1
・Power consumption of VO2 power transistor:
PC2 = (VCC − VO2) × IO2
・Power consumption due to circuit current:
PC3 = VCC × ICC
→PC = PC1 + PC2 + PC3
Refer to the above and implement proper thermal designs so that the IC will not be used under excessive power dissipation
conditions under the entire operating temperature range.
・Calculation example (BA33D15HFP)
Example: VCC = 5V, IO1 = 200mA, and IO2 = 100mA
・Power consumption of 3.3V power transistor:
PC1 = (VCC − 3.3) × IO1 = (5 − 3.3) × 0.2 = 0.34W
・Power consumption of 1.5V power transistor:
PC2 = (VCC − 1.5) × IO2 = (5 − 1.5) × 0.2 = 0.35W
・Power consumption due to circuit current:
PC3 = VCC × ICC = 5 × 0.0085 = 0.0425 (W) (See Fig.16 and 17)
Implement proper thermal designs taking into consideration the dissipation at full power consumption
(i.e., PC1 + PC2 + PC3 = 0.34 + 0.35 + 0.0425 = 0.7325W).
*VCC: Applied voltage
IO1:Load current on VO1 side
IO2:Load current on VO2 side
ICC:Circuit current
* The ICC (circuit current) varies with the load.
(See reference data in Fig.4, 5, 16, and 17.)
VCC
VO1
VCC
VO2
V02_S
VCC
VO1/VO2
VO1
VO2
Controller
3.3 V output
VCC
GND
VCC
VCC
Power Tr
1.5 V output or
1.8 V output
IP
ICC
IO1
IO2


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